New tool to help visualize /proc/interrupts and info in /proc/irq/$INT/

This is a start, not ready for release yet, but already useful as a diagnostic tool. I wanted to see how my IRQs were laid out, as this has been something of a persistent problem. I’ve built some intelligence into our irqassign.pl tool, but I need a way to see where the system is investing most of its interrupts.
I omit (on purpose) IRQs that have been assigned, but have generated no interrupts. I haven’t (as of yet) worked the driver bits backward to reach to the module/kernel driver responsible. I do plan to do this.
This is on one of our engineering systems in the lab.
Is it me, or does IOAT look borked? As I said, this is for visualization. I’ll get the code up on github tomorrow. It uses sparklines, but in the absence of that, it will return actual counts.